(PU) Elastome ya Polyurethane Irwanya Umunaniro, Ubushyuhe Bukabije, Yivura Yonyine: Yakozwe binyuze mu muyoboro wa Dynamic Covalent Adaptive Network Hashingiwe kuri aside Ascorbic

Abashakashatsi bakoze elastomer nshya ya polyurethane ishingiye ku muyoboro wa aside ascorbic ukomoka kuri aside (A-CCANs). Binyuze mu gukoresha ingaruka za keto-enol tautomerism na carbamate bonds, ibi bikoresho bigira imiterere idasanzwe: ubushyuhe bwo kubora kw'ubushyuhe bwa 345 °C, stress ya fracture ya 0.88 GPa, imbaraga zo gukanda za 268.3 MPa (ingufu zifata 68.93 MJ·m⁻³), n'imbaraga zisigaye ziri munsi ya 0.02 nyuma y'ingendo 20.000. Igaragaza kandi kwivura mu masegonda make kandi ikora neza kugeza kuri 90%, itanga igisubizo cyiza cyo gukoresha mu bikoresho by'ikoranabuhanga n'ibikoresho by'ubwubatsi.

Ubu bushakashatsi bw’ibanze bwubatse urusobe rw’ibintu bihindagurika (A-CCANs) hakoreshejwe aside ascorbic nk’inkingi y’ingenzi. Binyuze mu buryo bwakozwe neza na keto-enol tautomerism na dynamic carbamate bonds, hakozwe elastomer idasanzwe ya polyurethane. Ibikoresho bigaragaza ubushyuhe bungana na polytetrafluoroethylene (PTFE)—hamwe n’ubushyuhe bwo kubora bugera kuri 345 °C—mu gihe bigaragaza uburinganire butunganye bwo gukomera no koroha: stress nyayo ya 0.88 GPa, n’ubushobozi bwo kugumana stress ya 268.3 MPa munsi ya 99.9% ya stress yo gukanda mu gihe yinjiza ingufu za MJ·m⁻³ 68.93. Igitangaje kurushaho, ibi bikoresho bigaragaza stress isigaye iri munsi ya 0.02% nyuma y’amasaha 20.000 ya mechanical, ikiza ubwayo mu isegonda rimwe, kandi igera ku musaruro wo kongera gukoresha 90%. Iyi ngamba yo gushushanya, igera ku mugani wa "kugira ikirenge cy'amafi n'idubu", itanga igisubizo cy'umwimerere ku bikoresho nk'ibikoresho byo kwambara neza n'ibikoresho byo mu kirere, aho imbaraga za mekanike no kuramba kw'ibidukikije ari ingenzi cyane.